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Bi-Zr-Modulated CO2 Microenvironment Enables High-Rate CO2 Electroreduction.

Yuta Takaoka1, Euiyoung Choi2, Hyo-Young Kim1

  • 1Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.

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Summary
This summary is machine-generated.

Bismuth-zirconium composite catalysts improve electrochemical CO2 reduction. Zirconium addition suppresses pH rise, enhancing CO2 availability and boosting formate production by 1.4 times.

Keywords:
bismuthelectrochemical CO2 reductionformatezirconium

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Engineering the local chemical environment is key for electrochemical CO2 reduction reactions (CO2RR).
  • Bismuth-zirconium composite catalysts (Bi-Zr-KB) were developed to modify the CO2 microenvironment in alkaline flow cells.

Purpose of the Study:

  • To investigate the effect of zirconium incorporation on bismuth-based catalysts for CO2RR.
  • To optimize the Bi/Zr ratio for enhanced catalytic performance and formate selectivity.

Main Methods:

  • Synthesis of Bi-Zr-KB catalysts with varying Bi/Zr ratios.
  • Electrochemical testing in an alkaline flow-cell system.
  • Material characterization using XPS, SEM, EDX, XAS, EIS, and in-situ Raman spectroscopy.
  • Density functional theory (DFT) calculations.

Main Results:

  • The Bi-Zr-KB catalyst with a 2:1 Bi/Zr ratio achieved a current density of -176 mA cm⁻² and 88% formate Faradaic efficiency at -0.6 V.
  • This represents a 1.4-fold performance enhancement compared to the bismuth-only catalyst.
  • Zr incorporation suppressed local pH rise and improved CO2 availability, while DFT calculations indicated enhanced CO2 adsorption and charge transfer at interfacial Bi-Zr phases.

Conclusions:

  • Zirconium incorporation effectively modulates the catalyst's microenvironment, overcoming CO2 mass transport limitations.
  • Bi-Zr-KB catalysts offer a promising strategy for high-rate electrochemical CO2 conversion to formate.
  • The study highlights the importance of interfacial engineering in catalyst design for CO2RR.